Robust Error Handling and Exit Strategy in Bash

#!/bin/bash

# Exit immediately if a command exits with a non-zero status.
set -e

# Keep track of the last executed command, if we're in debug mode.
# trap 'last_command=$current_command; current_command=$BASH_COMMAND' DEBUG

# Function to be called on EXIT, ERR, INT, TERM signals
cleanup() {
    echo "Performing cleanup operations..."
    # Add your cleanup commands here, e.g., removing temporary files
    # rm -f /tmp/myapp_temp_file.txt
    echo "Cleanup complete."
}

# Trap signals for robust exit handling
trap cleanup EXIT     # Always run cleanup when script exits
trap 'echo "ERROR: A command failed. Script will exit."; cleanup; exit 1' ERR # Run cleanup and exit with error on command failure
trap 'echo "WARNING: Script interrupted by Ctrl+C. Exiting."; cleanup; exit 1' INT # Handle Ctrl+C
trap 'echo "WARNING: Script terminated. Exiting."; cleanup; exit 1' TERM # Handle kill signal

log_message() {
    local type=$1
    local message=$2
    echo "[$(date +'%Y-%m-%d %H:%M:%S')] [$type] $message"
}

log_message INFO "Starting script execution."

# Simulate some operations
log_message INFO "Attempting operation 1..."
sleep 1
# Example of a command that might fail (uncomment to test error handling)
# ls /nonexistent_directory
log_message INFO "Operation 1 successful."

log_message INFO "Attempting operation 2..."
sleep 1
# Example of a command that will succeed
echo "Hello from script." > /tmp/temp_output.txt
log_message INFO "Operation 2 successful."

# Simulate a graceful exit
log_message INFO "Script finished successfully."
exit 0